[8:03 p.m.]: All I-75 North lanes have reopened, but heavy delays linger into northwest Atlanta, according to the WSB 24-hour Traffic Center.

[7:02 p.m.]: The vehicle is a CobbLinc Transit bus, which Georgia State Patrol troopers said was engulfed in flames when they arrived on the scene.

All passengers were able to get off the bus unharmed, GSP said. It’s unclear how many people were on the bus.

Atlanta Fire Rescue is investigating the cause of the fire.

Traffic has begun to move on I-75 North.

UPDATE [6:38 p.m.]: All I-75 North lanes have been blocked at Mt. Paran Road due to a bus fire, Atlanta Fire Rescue said. It's unknown if there are any injuries, and it's unclear when the interstate will reopen.

The WSB 24-hour Traffic Center recommended to use Northside Drive as an alternate.

ORIGINAL STORY: Temperatures are slow to rise Wednesday with lots of cold air pouring into North Georgia from the Arctic.

Metro Atlanta has made it only to 40 degrees at midday, but there is still a way to go. The projected high is 53, which is about average for this time of year, according to Channel 2 Action News.

It’s a marked difference from Tuesday, which topped out near 70 degrees early in the day. Temperatures were 30 degrees lower Wednesday morning.

The chill in the air is not going anywhere anytime soon, Channel 2 chief meteorologist Glenn Burns said.

“It’s going to stay here for a few days, and then more rain develops and another wave of cold weather comes in,” he said.

The colder weather is the result of a front that moved through Tuesday. The front cleared the state Wednesday afternoon and took the lingering moisture with it.

A few areas of mist and drizzle stuck around for the morning drive, according to Channel 2. Some areas in northwest Georgia got a light dusting of snow overnight.

Burns said North Georgia will turn increasingly sunny in the afternoon, but a northern wind will make it feel colder than it really is. Any remaining clouds from the cold front should clear out by this evening, making for optimal viewing of the last full moon of the decade.

The December event is called the cold moon, Burns said.

“We'll see the clouds move on out tonight, a nice clear sky with diminishing winds across northern Georgia,” he said. “Something to look forward to.”

The next chance of rain arrives in Georgia on Thursday evening as moisture from the Pacific interacts with cold air to the north. Low pressure in the Gulf will start spreading rain our way ahead of Friday’s morning commute, according to Channel 2.

“Get ready: Friday is going to be a wet, terrible day across northern Georgia,” Burns said.

A cold rain is 80% likely, which could prove troublesome for fans taking in the high school football state championships at Georgia State Stadium.

Things are looking up for the weekend. After Saturday’s 60% chance of some early showers, Sunday should be a dry day with highs near 60, according to the latest forecast.

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Traffic is slow through the Westside at midday, but the delays should clear up in time for the start of the Wednesday evening commute.

All lanes have reopened on I-20 East after a tractor-trailer crash at Fulton Industrial Boulevard, according to the WSB 24-hour Traffic Center. Tough delays remain leaving Thornton Highway at 1 p.m.

The Traffic Center suggests drivers take U.S. 78 until the interstate recovers.

» For a detailed forecast, visit The Atlanta Journal-Constitution weather page.

» For updated traffic information, listen to News 95.5 and AM 750 WSB and follow @ajcwsbtraffic on Twitter. 

» Download The Atlanta Journal-Constitution app for weather alerts on-the-go.